How to bin struct fields based on value in another field?

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Nicholas Kavouris
Nicholas Kavouris 2023-1-22
回答： Walter Roberson 2023-1-22
I have a structure with multiple fields. I would like to plot a histogram of values of data in one field based on conditions in another field of each row of the struct. How would i do this?
EX:
test(1).initial=13
test(1).final=43
test(2).initial=8
test(2).final=58
test(3).initial=[26,14]
test(3).final=52
i would like to bin test.final so rows with corresponding test.initial(1) values 0-10, 11-20, 20-35 are grouped together
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Nicholas Kavouris
Nicholas Kavouris 2023-1-22
i only want to bin based on test.initial(1), any index beyond 1 is ignored
Nicholas Kavouris
Nicholas Kavouris 2023-1-22
i added this in as the struct i am working with has a variable number of indices in each row in the column id like to sort by

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回答（1 个）

Walter Roberson
Walter Roberson 2023-1-22
initials = arrayfun(@(S) S.initial(1), test);
finals = [test.final].'; %assuming only one value per entry
bins = discretize(initials, [0 11 21 35]);
splitapply(@histogram, finals, bins);
legend({'[0-11)', '[11-21)', '[21-35]'});
Your bin list included 20 twice, and does not include the range between 10 and 11 (exclusive), so I had to guess what you wanted.

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